How to Change the Default Application for a given Extension on Ubuntu

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Tested on Ubuntu 16.04/Unity

Right click, 'open with'

Doesn't work for all files but, if it works for you, it's the easiest approach.

open-with Right-click on a file, then follow theses steps to change the default application.

Edit defaults.list file

Only if you know the file's mime-type

Open file /usr/share/gnome/applications/defaults.list and change the application for the mime-type you want.

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